MRCOOL / DIY 5th Generation
PC 45 error code
The outdoor IR chip detects its own parameter error when powered on.
- Severity
- technician
- Verified
- Jul 18, 2026
What triggers it
The outdoor IR chip detects its own parameter error when powered on.
What to do
- Power off, then restart the unit 2 minutes later.
- Replace the inverter module PCB.
Reset procedure
Power off, then restart the unit 2 minutes later.
Which systems show it
- MRCOOL DIY 5th Generation single-zone 9k, 12k, 18k, 24k, and 36k D25 indoor/outdoor models listed in manual section 1.1.
Related codes
Technician scope
Technician-tier outdoor auxiliary board diagnostic; see service manual section 4.3
Source
- Document
- data/sources/mrcool-diy5-service.pdf
- Section
- 4.7 TS40: ODU IR chip drive failure diagnosis and solution
- Page
- 83